Explanation :
The first four lines' first part signifies a visible lie, while the second part a not so obvious but definite truth.
तारा जो ... - means the star which you see in the sky has long back moved from that position.
मटमैली ... - means people think that all the body and soul have been purified with the ashes immersed in Ganga, while many of the remains still lie muddied at the crematorium
यादे सतरंगी ... - my memories are picture perfect with all vivid colors, yet mind is still not a pure frequency with all shades dark.